Actually, what Hitler said or didn't say is irrelevant to this discussion unless you try to impugn atheism as a sort of nazism which seems to be implied, here. Hitler was a mad man and anything he says must be taken in that context.

The same would be true for anyone impugning atheism as a form of nazism or totalitarianism.

The fact that the Catholic Church helped Nazis is on historical record.

The fact that churches existed in Nazi Germany should tell you something.